Graphic user interface for a portion of a display screen



The FIGURE is a front view of a graphic user interface for a portion of a display screen showing our new design.

The broken line showing of a portion of a display screen is not part of the claimed design. The bottom perimeter of the portion of the display screen and the graphic user interface is understood to be flush. 

The ornamental design for a graphic user interface for a portion of a display screen, as shown and described. 